I did this in a room addition, used schedule 40, 1" PVC in the slab, to run signal cable to the surround speakers. Don't get suckered into buying overpriced cables. 12-14 ga from Home depot is just as good. In you HT room, you may want to consider building a raised wood floor instead of the slab. Sub woofers souns much better on wood floors since the sound waves are transmitted through the floor, not so with slab floors.